Clamp.



L VAN EENBURG.

CLAMP.

. APPLICATION fum) f m29, 1912.

@muted Mg.v 20, 1912.

unirti-erases refinar erro.

Jessie .van Dui-tense, ,oli commun, NEW YORK.

CLAMP.

Losasse. y i

specificati@ of Letters raient. Patentcdjiug. 2t), 1912..

Application tiled lfanuaryf, 1912. Serial No. 673,960.

ingf'is'a. full, clear, and exact specification.4

i justment.

The invention relates to-'clainps ,used mainly by Joiners, and comprising a sub stantially Ueshaped vframe, with a thumb screw mounted in one arm of the frame and movable toward and from the ether arm.

ln my invention the arm carrying the screw' v has a special formatirn to constitute afsplit nut, so that the screw may be rfmovedinstantly and replaced to adjusty itl approximately to the Work being clamped, the tightening of the screw being then eiected `by turning in the usualfnianuer. lili -this way the screw can advantageously have4 a tine thread, since a quiet; movement is not necessary after the' approximate bodily adln connection with `the"screw l also provide an improved form' of siviveled head. 'Y Q l rlhe invention will -be particularly described in connection With the illustrated example defined in the claims. Refer-nice is to be ha'l`to the'zn'compauying drawings forming a part` ci' this specication, in which similar ocharacters of reference indicate corresponding parts in all the figures.

Figure 'l is a side elevation of the clamp embodying my invention, the head of the screw being shown in section; Fig` 2 is a rear 'end vie7 of the clamp Without the screw; Fig. B is a transverse vertical section on the line 3F-3 of Fig .--l, the screw being omitted; Fig. Ll-is a fragmentary side vievv of the sliding' cap for holding the split nut in a closed position; and Fig. 5 is a perspecf tiveview of thesplit ring employed to provide a bearing surface Within the swiveled head of the screw.

ln forming a clamp in accordance with my invention the body 1Q is'of general U- shape as in similar clamps, and in one arm 1l thereof the thumb screw l2 is mounted for axial movement toward and from the opposed arm 11, or other fixed clamp member to cooperate with the arm. The arm 11 is divided on a line preferably inclined to the general plan of the clainp, to constitute the split nut, which consists of a fixed integral member 13. and a hinged member le,

said members being formed with mating l{recesses 15, 16, Which in the lclosed position of the members constitute a threaded eye for lthe screw 19. *hinged member 14 and the xed member 13 The connection between the'A jmay be effected as shown, by forming a ref' duced hinge lug 17 on the memberH le and al corresponding recess 18 in the fixed*ii'iemberV cr'vicefversa, the hinge pin 19 completingi-heronnection. A' f, spring is provided,normally tending t'o open 'the split nut, and advantageously at la ypoint between the thumb screwl and thehinge pin 19. The preferredform consists of an expansive helical spring 20, theends' fof which are seated in opposed pockets 2l,-

4:22, formed respectively in the fixed and the f hinged members of the split nut.

To eil'ectively carry out the purpose of' :my invention' it is of importance that the? :splitjnut be opened and closed with de tspa'tchfor the quick ent-ranceand removal of. thet-humb screw, andto this end l provide a Special arrangement for holding the hinged memberof the split uut `in the closed position and permitting its quick release. It will be 'observed that the members 13, 14;, terminate at the upper ends in reduced projections 23, 24.-, preferably of such a forrr thaty when brought together in a closed position of the split nut, they will constitute the halves of a. divided round stud, over which Hts a sliding cap 25, which has a Slot 26 through which passes a headed stud 27 carried on the terminal pr= jection the arrangement being such that the cap has a limited movement outwardand inward on its support-ing terminal 23.

lty will be observed frein Figs. 2 and 3, that the cap 25 is out away, at the bottom at the side toward the projection 24 of the hinged member 1%, as at '128, so that at the mentioned side it has a reduced height, the purpose of which is to allow the longer end 29 to rest on the member 18A at the base of the terminal projection Q3, and while the opposite reduced stud sufficiently overlaps the opposite projection 24, to holdk the hinged member 14. of the split nut in the closed position; butoat the same time only a slight outward movement o the cap is necessary to release the split nur.

lnoonnection with the siviveled head 30 of the screw, and between the same and the asplit ring/ 32, Whichprovides a removable wezir surface, and which may be sutliciently hard to withstand weer. The construction, also permits the removal ot the split lining :md its ready renewal.

By providing a split nut with the line of separation between the members disposed at en angle to the general plane ot the trame, l am enabled 'to preserve the essentiel strength of the :trame so that no reel weekeiiing results from the provision of the split nut. Thos it will be observed that the integral member 13, et its base and at the point at which the hinged member let is secured,

' is substantially the full width of the arm. ll,

:mtl that the said. men'iber 13 has subst-untieil width up to the threaded recess which receiif'es the screw, so that the said member 13 has no material reduction in strength eX- cept at points adjacent to the screw, :md that the strain of vthe screw on the reduced parte of the clamp is exerted through a short leverage, so to speak; whereas itl the members of the split mit had e line et separation parallel with the general plane. of the trame, it is obvious that there woulfl be two members of reduced width extending almost'to the buse ot' the arm 11, and on which the' strain ot the screw would be exerted through a, long leverztge,and thus the acl- Vantage of the inclined line of separation wlll be apparent; moreover, by utilizing a fixed member oit the treme :is one of the elements of the split nut, convenience is promoted in placing and replacing the screw, since the trame may be held, when manipulating the screw, in such :i marmer als to af'- torcl support for the latter, and give the screw less tendency to fall out of the tremeV when the hinged member of the split nut is released.

Having thus described my invent-ion, I claim as new, and desire to secure by Letters Patent,- l. A clamp, comprising a trame having members thereon constituting a split nut, one oit-seid, members being integral with the frame and the other hinged .to move toward and. from the said fixed yihrerriber, and a :clamp screw held by the split mut, the line of seperation between the fixed'fend movable members of the split nut. being inclined'to the plane of the clamp.

2. A clamp comprising a tremo presentieg two arms one of which is clivirled on a line at en angle to the plane of the [trame to constitute o, split mit, and e. clump screwheld by the seid split nut. l

In testimony whereof I have signed ma name to this specification in' the presence ot two witnesses.

JESSE VAN DENBURG. Witnesses JENNIE A. KINNEY,

HENRY A. DioiuNsoN. 

